Plane iron



N. D. MERWIN.

, PLANE mow..

l APPUCATION FILED MAY 20,'1921.

mount thereon, at

futTTan STATES PATENT fornace.

NEWTON D. MRWN, OF HEGGANUM, CGNECTICUT, ASSIGNOR F ONE-HALF T0 JPHEMP W. JPGRTERI, OF HIGGANUM., GONNECTXGU'R I nanna man.

il ,419 Armi?.

application met may at,I

To all whom t may concern:

Beit known that li, NEWTON D. MERWIN, a citizen of the United States, and a resident of Higganum, in the county of Mid-1 dlesex and State of Connecticut, have invented certain new. and yuseful improve- Vments in Plane Irons, which improvements are fully set forth in the following specification. This invention relates to improvements in devices 4of that vclass available in con'unction with a suitable stock for surfaceressing purposes, such-devices being commonly known as plane irons.

rlihe object "of this invention is to provide a plane iron which shall embody a displaceable cutting-edge; be simple and inexpensive as regards its construction, durable elfi- Icient and reliable in practical service, and

i same, as alono thedotted line 2'-2 of Fig. 1.

Fig. 3 'is a ottom'plan view of the device, the cutting-blade thereof being partially displaced.

Figpt is a detail view showinggpartially in elevation and partially in section my im` proved plane iron in its application to a stock.

Having reference to the accompanying drawing, wherein similar reference-charactersdenote like parts throughout the respective views, I, in carrying out my present invention, provide a plane iron 2 of the cus tomary general forni, and displaceably its advance end, a cuttingblade 2. j

While the mountingof the cutting-blade 2 on the iron 2 may be effected in any convenient and appropriate manner, I purpose in this connection and bypreference, to fit 1. the iron 2,-somewhat rearwardly of its adlr Specification QfrLett'ers Patent. Patented Jun@ 13, W922i,

'19521. serial no, ermee.

.. Vance end, with a transverse dovetailed depression 3, forL the reception endwise and by a sliding action only, of thetransverse dovetailed r1b 4 with which the cutting-blade 2 1s provided at the rear face thereof and somewhat rearwardly of its cutting-edge, the opposite sidewalls of the depression 3 being duly undercut to this end.

While casual displacement of the cuttingblade aforenamed from its position of service relatively to the iron 2 is obviated in practice by the opposite side-walls of the stock, as 5, in conjunction with which the assembled iron and cutting-blade may be used, it is advisableF that said cutting-blade be directly subjected to a clamping stress, whereby the same shall become locked with' substantial rigidity in its disposition relatively to said iron; and to this end l provide the usual cap-plate 6, which is superimposed, as in common practice, upon the iron 2 and is there firmly held by means of a suitable lock-screw 7. ,A

rllhe lock-screw 7, fitted with a head 7', projects through, as in common practice, Both the cap-plate 6 and the iron 2 and has a threaded engagement with -the latter.

. Hence, turning said lock-screw duly homeward causes its head 7 to en age the ca plate 6 thereunderrand there y causes the advance edge of the cap-plate to bear with a clamping effect upon the cutting-blade locked in itsl disposition relatively to the advance end-portion of the ironl 2 thereunder.- v

In practice the advance end of the capplate 6 is best curved downwardly somewhat, substantially as indicated inthe drawing.`

As to the. utility of my improved plane iron, it may be pointed out that since no cutting-edge yis required'for the iron ypro er,

'the same maybe formed from materlal ess expensive than is required where the cuttingedge islformed directly thereon and the iron is subjected to ay hardening process, as in common practice. i

Again, should the cutting-blade of my improved plane iron become nichedbr other-a wise materiallynjured in service, .the same may, when rendered by such injury. un-

suitable for re-grinding, be discardedand thereunder, thereby the latter becomes lio a fresh one substituted therefor, the cost o f each of such cutting-blades being quite nomlv nal and the user keeping himself supplied,

` as occasion may dictate, with an emergency supply thereof.

It will be qulte apparent that each uttingblade made use of is best formed from steel and hardened;

My improved plane iron; together with the cap-plate locked in is inserted into and adjusted within the stock 5 and there removably 'held byxmeans of a suitable key orwedge 8, all as in common practice. A v .I

llt will" be seen that my improved plane iron is welll adapted for the purposes for which it is intended, and further that the same may be-modiied to a considerable extent,v particularly as rregards the means availed of forl displaceably mounting the Iout material departure being made from cutting-blade on the plane iron proper, wit-lilit e spirit and principle of my invention as set forth in and coming `within the `scope of the claims hereto appended and forming apart hereof. e

l claim: 'v

1-. An iron of the class herein described formed withadovetailed depression extending continuously transversely along one face thereof somewhat rearwardly of its advance end, `said-l iron fitted with a cutting-blade having a dovetailed. rib extending transversely along one face thereof somewhat rearwardly of its cutting-edge, said rib having an endwise sliding fit only within the de pression afprena'med.

position thereon as stated,

imago@ ing continuously transversely along one faceI thereof somewhat rearwardly of its advance end, said iron fitted with. av cutting-blade having a dovetailed lrib extending transversely along one face thereof somewhat rearwardly of its cutting-edge; and locking means for preventing casual displacement of said cutting-blade from its position of service relatively to said iron, said rib having an endwise sliding Vfit only within the depression aforenamed.

3. An iron of the class herein described formed with ya dovetailed' depression extending continuoudly transversely along one face thereof somewhat rearwardly of its advance end, said iron lfitted with a cutting-blade having a dovetailed rib extending transversely along one face thereof somewhat rearwardly of its cutting-edge; a cap-plate superimposed on said iron and 4bearing at its advance end on the cutting-bladeltherelander; and a lock-screw, said lock-screw through both the cap-plate and said iron and having a threaded engagement uwith the latter, and adapted, when turned r projecting duly homeward, to draw andhold the capplate into elamping engagement with the cutting-blade thereunder, said rib having an endwise sliding fit only within the depression aforenamed.

\ Nnwronl n. Mnnwrn. 

